Oh, it's just not leaking out and the team's results seem to be getting better lately. Mourinho is a great motivator and has achieved a lot in football thanks to this, but at the same time he is quite toxic when the team does not succeed and this has been manifested more often lately.
Mourinho is good to boost his players to their limits. Positively, it brings very good results and bring titles when players put their best efforts to play for the club and for themselves with their ego triggered by Mourinho.
Negatively, it causes serious conflicts among Mourinho and his players that lead to another serious issues for all: players have worse performance than they usually have, Mourinho lose control, club have very bad results in long run. In the end, Mourinho will get sacked because nowadays, club will not sacrifice star players just to protect a coach.
This is the reverse side of the coin of the phenomenon of such coaches as Mourinho or Conte, when specialists shake up the team in the shortest possible time and force them to show much better results, but this lasts for a maximum of several seasons and then the specialist is forced to leave, heating up relations with the team and its management to the point of impossibility.
Mourinho, Conte and Simeone are similar coaches with their defense, counter attack tactics and their psychological approach for their players. You are right, there are adverse effects of the approach and both Mourinho and Conte already got sacked a few times. Only Simeone has gotten full support from Athletico Madrid and has a safe coach position in the club so far.